[R] Edges and Rasters

[riodementa]

Hi everyone!

I would like to draw a line surrounding my raster, with i want it in black, 
and i don't know if its possible to change the colour.

A simple example is:

r <- raster(nrow=30, ncol=30, xmn=0)
r[]<-NA
r[393:409]<-99
r[423:439]<-99
r[453:455]<-99
r[456:460]<-30
r[461:469]<-99
r[483:499]<-99
r[513:529]<-99
plot(r,col=terrain.colors(100))
plot( edge(r, type='outer'))

Could anyone help me??
Thanks

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